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Arianespace Launchkit Intelsat-902

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Arianespace Launchkit Intelsat-902 Flight 143 19th launch for Intelsat Arianespace’s sixth launch of the year will orbit the Intelsat 902 commu- nications satellites. This is the second spacecraft in Intelsat’s new genera- tion IX series, and this launch provides confirmation of Intelsat’s confi- dence in Arianespace. The Intelsat IX generation is providing two to three times the power of the satellites being replaced, offering customers better quality and the ability to implement more cost-effective ground facilities. Intelsat 902 will be the 19th Intelsat satellite launched to date by Ariane. Built by Space Systems/Loral in Palo Alto, California, it will be positioned at 62 degrees East. Intelsat 902 joins the Intelsat fleet of satellites provid- ing Internet, broadcast, telephony and corporate network solutions ser- vices for Europe, sub-Saharan Africa, Central Asia, the Far East and Australia. The first series 9 satellite, Intelsat 901, was launched by Arianespace Flight 141 on June 9. Four more Intelsat satellites are scheduled for launch by Arianespace. For Flight 143, Arianespace will use an Ariane 44L, the version fitted with four liquid-propellant strap-on boosters. 1 - ARIANESPACE Flight 143 mission. 2 - Range operations : ARIANE 44L – Intelsat 902. 3 - Countdown and Flight events. 4 - Flight 143 trajectory. 5 - The ARIANE 44L launch vehicle. 6 - The Intelsat 902 satellite. Annexes 1 - Flight 143 key personnel. 2 - Launch environment conditions. 3 - Synchronized sequence. 4 - ARIANESPACE orderbook. 5 - ARIANESPACE, ESA and CNES. For more information, visit us at www.arianespace.com Arianespace - Flight 143 | 1 Flight 143 1 - Arianespace Flight 143 - to be launched August 30 with the Intelsat 902 satellite To allow Intelsat additional routine checks on the spacecraft in Kourou, Arianespace has res- cheduled Flight 143 from the original August 24 launch date. Final mission preparations with the spacecraft and its Ariane 4 launch vehicle are now set to begin on Monday, August 20. Liftoff of Flight 143 using an ARIANE 44L is now scheduled for Thursday, August 30,at the opening of the following launch window: Heures du lancement GMT Paris Time Tokyo Time Washington Time Kourou Time From 06:46 am 08:46 am 15:46 pm 02:46 am 03:46 am to 07:46 am 09:46 am 16:46 pm 03:46 am 04:46 am on August 30, 2001 August 30, 2001 August 30, 2001 August 30, 2001 August 30, 2001 2. Range operations campaign: ARIANE 44L – INTELSAT 902 The actual work for satellite range operations lasts 23 working days for Intelsat 902 from its arrival in Kourou (before encapsulation). The ARIANE 44L preparation campaign lasts 25 working days. Satellite and launch vehicle campaign calendar Ariane activities Dates Satellite activities July 17, 2001 Intelsat 902 arrival in Kourou and beginning of its preparation in S1B building. Campaign start review July 19, 2001 First stage erection July 19, 2001 Second stage erection July 20, 2001 Third stage erection July 27 2001 Liquid strap-on boosters erection July 24-27, 2001 Roll-out to launch pad August 9, 2001 August 13, 2001 Intelsat 902 transfer from S1B to S3B building. August 16, 2001 Beginning of Intelsat 902 filling operations. D-7 Monday, Aug. 20, 2001 Start of combined operations D-6 Tuesday, August 21 Satellite encapsulation operations. D-5 Wednesday, August 22 Satellite composite transfer to the launch pad. D-4 Thursday, August 23 Satellite composite mating onto launcher and overall checks. D-3 Friday, August 24 Launch Rehearsal D-2 Monday, August 27 Launch Readiness Review (RAL) and launcher arming. D-1 Tuesday, August 28 Filling of 1st stage, and 2nd stage, and liquid boosters with UH 25 and N2O4. D-0 Wednesday, August 29 Launch Countdown including 3rd stage filling with liquid oxygen and liquid hydrogen. H-0 Thursday, August 30 Erratum: To read p7, Payload section, 72 C-band transponders (36MHz equivalent units) and 22 Ku-band transponders (36 MHz equivalent units). For more information, visit us at www.arianespace.com Arianespace - Flight 143 | Flight 143 3. Launch countdown and flight events The final launch countdown runs through all the final launcher and satellites related operations. It configures the vehicle and its payload for ignition of the first stage and PAL engines at the selected launch time, as soon as possible within the launch window authorized by the spacecraft. A synchronized sequence (see Appendix 3), controlled by the Ariane ground check-out computers, starts at H0 - 6mn and concludes the countdown. Should a hold in the countdown delay the H0 time beyond the launch window, the launch is postponed to (in days) : D + 1 or D + 2 (or later) depending on the source of the problem and the time to resolve it. Time Events – 12h 30 mn 00 s Start of final countdown. – 5 h 35 mn 00 s Start of gantry withdrawal. – 3 h 35 mn 00 s Start of the 3rd stage filling operations with liquid hydrogen and liquid oxygen. – 1 h 5 mn 00 s Activation of launcher telemetry, radar transponders, telecommand. – 6 mn 00 s “Green status for all systems” to authorize : start of synchronized launch sequence – 3 mn 40 s Spacecraft switched to on-board power (latest time). – 1 mn 00 s Launcher equipment switched to on-board batteries. – 09 s Inertial platform released. – 05 s Release command to cryogenic arms retraction system. HO Ignition of first stage and liquid strap-on boosters engines + 4,4 s Lift-off. + 16 s End of vertical ascent phase of pitch motion (10 s duration). + 2 mn 30 s Liquid strap-on booster jettison. + 3 mn 31 s First stage separation. + 3 mn 34 s Second stage ignition. + 4 mn 22 s Fairing jettison. + 5 mn 43 s Second stage separation. + 5 mn 48 s Third stage ignition. + 6 mn 30 s Launcher acquired by Natal station. + 12 mn 30 s Launcher acquired by Ascension Island station. + 17 mn 30 s Launcher acquired by Libreville station. + 18 mn 42 s Third stage shutdown sequence. + 20 mn 49 s Intelsat 902 separation. + 21 mn 00 s Start of the third stage avoidance maneuver. + 22 mn 23 s End of Arianespace Flight 143 mission. For more information, visit us at www.arianespace.com Arianespace - Flight 143 | 4 Flight 143 4. Flight 143 Trajectory The launcher ascends vertically from lift-off to H0+16 sec. During a period of 10 sec. after this vertical ascent, the launch vehicle tilts in the pitch plane defined by the trajectory and pre-calculated by the on-board computer. The vehicle’s attitude is commanded by a predetermined law. The guidance phase is initiated 10 sec. after ignition of the 2nd stage. The attitude law in the pitch-and-yaw plane is optimized in order to minimize the 3rd stage propulsion time necessary to reach the target orbit with a performance margin of about 164 kg (360 lb).This ensures reaching this orbit with a probability of about 99% before the exhaustion of third stage propellant. The roll law is applied so as to improve the launcher/ground station radio link budget. Typical trajectory for standard geostationary transfer orbit and ground station visibility Trajectoire de lancement Orbite géostationnaire Launch trajectory Geostationary orbit Orbite de transfert Geostationary transfer orbit Extinction du 3e étage Third stage burnout Séparation Séparation du 1er satellite du 2e satellite Separation Separation 200 km of first satellite of second satellite Séparation du 2e étage Second stage separation 150 km Largage de la coiffe Fairing jettison 100 km Séparation du 1er étage First stage separation 50 km Largage des propulseurs Booster jettison For more information, visit us at www.arianespace.com Arianespace - Flight 143 | 5 Flight 143 5. The launch vehicle 56,3 m Vehicule Equipment Bay (Astrium) • 1,03 m length, • 4 m diameter, Fairing (Contraves) • 520 kg • 8,62 m length, • 4 m diameter, Liquid Hydrogen Tank • 750 kg 3rd stage (EADS launch vehicles) • 11,05 m length, • 2,6 m diameter, • 1,67 T Liquid Oxygen Tank Séparation 2/3 HM 7B (Snecma moteurs) 2/3 interstage 2nd stage (Astrium) • 11,61 m length, • 2,6 m diameter, N2O4 Tank • 3,4 T UH25 Tank Separation 1/2 Viking (Snecma moteurs) 1/2 interstage 1st stage (EADS launch vehicles) • 23,39 m length, • 3,8 m diameter, • 17,6 T N2O4 Tank UH25 Tank Liquid strap-on booster - Pal (Astrium) • 19 m length, • 2,2 m diameter, • 4,5 T Prime contractor : Arianespace Industrial Architect : Mass lift-off : 486 metric tons EADS launch vehicles Thrust at lift-off : 5440 kN For more information, visit us at www.arianespace.com Arianespace - Flight 143 | 6 Flight 143 6. The Intelsat 902 satellite Customer Intelsat Prime contractor Space Systems/Loral in Palo Alto (California) Mission Internet, broadcast, telephony and corporate network solutions Mass Total mass (at lift-off) 4 723 kg (10 410 lb) Dry mass 1 978 kg (4 351 lb) Stabilization 3 axis Dimensions 2,80 m x 3,50 m x 5,56 m Span in orbit 31 m Platform FS1300 Extended Payload 44 C Band transponders 14 Ku Band transponders On-board power 8,5 kW (beginning of life) Life time 13 years Orbital location 62° East, above the Indian Ocean Coverage area Global with beams over Europe, Sub-Saharan Africa, Central Asia, Far East and Australia. Press Contact for Intelsat Susan GORDON Corporate Communications Director Tél. : +1 202 944 6890 – Fax : +1 202 944 7890 e-mail : [email protected] For more information, visit us at www.arianespace.com Arianespace - Flight 143 | 7 Flight 143 Annex 1 - Arianespace flight 143 key personnel In charge of the launch compaign Mission Director (CM) Daniel MURÉ ARIANESPACE In charge of the launch service contracts Intelsat 902 Mission Manager and (RCUA) Steve HALL ARIANESPACE ARIANE Payload Manager
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